JPS60200976A - Clad vessel - Google Patents

Abstract

PURPOSE:To obtain a vessel having superior consumption resistance and a long life by cladding the surface of a W-base metal with a Pt-base metal. CONSTITUTION:When a W or W alloy vessel is used as a crucible for melting glass or ore contg. metallic oxide at a high temp. or as a tray, a boat or the like for vacuum deposition, oxide is formed by a reaction with O2 in the air. Since this oxide is liable to evaporate, the vessel is required to be used in an inert atmosphere. Even though the vessel is used in such a way, when glass, ore or the like contg. metallic oxide is melted, O contained in the resulting melt bonds to W to shorten the life of the vessel. The surface of the vessel is clad with Pt or a Pt alloy by physical vapor deposition such as ion plating so as to obtain a vessel having superior oxidation resistance and a long life.

Description

[Detailed description of the invention] The present invention relates to a clad container.

Conventionally, containers made of W or W alloy have been widely used as crucibles for melting ores containing high-temperature glass and metal oxides, trays for vacuum deposition, boats, and the like. This is the melting point of W or about 340
This is because it has a very high temperature of 0°C and has excellent mechanical properties at high temperatures. However, when the temperature exceeds 500°C, W reacts with oxygen in the air to form an oxide, and this oxide easily evaporates, so it has to be used in an inert atmosphere, which is a hassle. . Furthermore, even when used in such an inert atmosphere, when melting glass or ore containing metal oxides, oxygen and W contained in the melt may be used.
The disadvantage is that the W in the container is eluted and the life of the container is short. For this reason, attempts have been made to improve the wear resistance by adding other metals to the alloy, but the reality is that no alloy has been discovered that is sufficient to prevent the oxidation of W.

The present invention was made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a container with excellent wear resistance and long life.

The present invention is a clad container characterized in that the surface of W or W alloy is coated with Pt or pt gold alloy.

In the present invention, l) j or pt gold alloy is used:
This is because pt has a melting point of 1770°C, which is as high as W, and it also has excellent oxidation resistance at high temperatures, especially oxidation resistance against metal oxides. However, since solid PT and PT gold alloy containers are expensive, it was decided to cover them. The coating is better than physical vapor deposition such as ion blasting, spackling or vapor deposition or wet vapor deposition. According to physical vapor deposition, pt atoms are buried in the surface layer of the W container, and W and pt atoms are buried in the surface layer of the W container.
This is because the adhesion strength of the gold alloy joint surface is increased, and a clad container with high mechanical strength can be obtained. In this way, pt
Or PT gold alloy coated rutsuban fG has excellent oxidation resistance,
Since the joint surface has excellent mechanical strength and G, it has a long life. In addition, for pt gold alloy, 1r-1)t, i
There is a mah-pt.

Examples and conventional examples will be described below.

[Example 1] The inner wall of a wlJ crucible having a U-shaped cross section with a wall thickness of 5 mm, a height of 100 mm, and an inner diameter of 3 Q mm was subjected to ion blating with l) l to a thickness of 10 μm under the following conditions.

Atmospheric gas: 2.0 x 10 ml 1g ionization'
City voltage, current: 40V, 5A 'tli J-melting: 9 kv, 300 m
A thermoelectron: IOV, 100A This is designated as implementation product 1.

[Example 2] W of the same shape as Example 1! On the inner and outer walls of the vrutsuho, a mag-nitron sputtering was applied to a thickness of Q and 1 mm under the following conditions.

Pressure: Ar gas 3 x 10 mva 11 g Applied voltage: 400 V High frequency power source: 13.56 Mllz This is referred to as Example 2.

[Conventional example]

The W-made Rutsuho used in Example 1 was used as a conventional product.

Next, 500 g of alkali zinc borosilicate glass was added to the above implementation products 1 and 2 and the conventional product in an Ar atmosphere at a temperature of about 1200°C.
It was used for 60 minutes. When this process was repeated 10 times, 50μ of the conventional product was removed from the surface of the W container, whereas only 7μ of Example 1 and 3μ of Example 2 were removed.

Next, when the bottoms of the containers of the implementation product 2 and the conventional product were directly heated in the atmosphere with a heater and held at a temperature of approximately 1000°C for 10 hours, the W in the conventional product was oxidized and evaporated, resulting in a weight loss of 20 g. On the other hand, there was no decrease in the amount of product 2.

For these reasons, the crucible of the present invention has significantly superior oxidation resistance as a crucible for dissolving metal oxides compared to conventional products, and in addition, Example 2, which is coated with PT alloy up to the outer wall, is oxidation resistant even when heated in the atmosphere. It can be seen that the quality is excellent.

As described in detail above, according to the present invention, it is possible to provide a crat container with poor wear resistance and long life. Moreover, if the W container is completely coated, it can be replaced for a long time even in the atmosphere, and expensive equipment is not required.

Applicant: Nakakuri Metal Industry Co., Ltd.

Claims (1)

[Claims] A clad container characterized in that the surface of W or W alloy is coated with PT or L)j alloy.